Aqueous photoresist of casein and N-methylol acrylamide

Abstract

The addition of N-methylol acrylamide as an accelerator to casein-based aqueous photoresist compositions reduces the baking temperature required to render the developed resist etch resistant.

I claim: 
     
       1. A photoresist composition comprising an aqueous solution containing from about 4-12 percent by weight of the composition of casein, sodium borate in an amount of from about 8-20 percent by weight of the casein and so that the final pH is from about 6.7 to 7.3; from about 2-20 percent by weight of the casein of a dichromate salt and from about 5-30 percent by weight of the casein of N-methylol acrylamide. 
     
     
       2. A photoresist composition according to claim 1 further including a surfactant. 
     
     
       3. A photoresist composition according to claim 1 wherein the dichromate is ammonium dichromate or sodium dichromate. 
     
     
       4. In an aqueous photoresist composition comprising about 4-12 percent by weight of the composition of an acid precipitated casein, a sodium borate alkalizer in an amount from about 8-20 percent by weight of the casein, and from about 2-20 percent by weight of the casein of a dichromate sensitizer, the improvement which comprises adding from about 5-30 percent by weight of the casein of N-methylol acrylamide.